Check for existing track before creating one. (#1459)

Signed-off-by: Timo K <toger5@hotmail.de>

src/livekit/useECConnectionState.ts

@@ -17,8 +17,10 @@ limitations under the License.
 import {
   AudioCaptureOptions,
   ConnectionState,
+  LocalTrackPublication,
   Room,
   RoomEvent,
+  Track,
 } from "livekit-client";
 import { useCallback, useEffect, useRef, useState } from "react";
 import { logger } from "matrix-js-sdk/src/logger";
@@ -54,6 +56,13 @@ async function doConnect(
   audioOptions: AudioCaptureOptions
 ): Promise<void> {
   await livekitRoom!.connect(sfuConfig!.url, sfuConfig!.jwt);
+  const hasMicrophoneTrack = Array.from(
+    livekitRoom?.localParticipant.audioTracks.values()
+  ).some((track: LocalTrackPublication) => {
+    return track.source == Track.Source.Microphone;
+  });
+  // We create a track in case there isn't any.
+  if (!hasMicrophoneTrack) {
     const audioTracks = await livekitRoom!.localParticipant.createTracks({
       audio: audioOptions,
     });
@@ -65,6 +74,7 @@ async function doConnect(
 
     await livekitRoom?.localParticipant.publishTrack(audioTracks[0]);
   }
+}
 
 export function useECConnectionState(
   initialAudioOptions: AudioCaptureOptions,